Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 1,712	$ 2,027	$ 1,470
Charged (credited) to costs and expenses	13,709	7,462	8,357
Deductions	(10,027)	(7,777)	(7,800)
Ending Balance	5,394	1,712	2,027
Deferred Tax Asset Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	33,499	29,049	17,728
Charged (credited) to costs and expenses	9,122	4,450	11,321
Ending Balance	$ 42,621	$ 33,499	$ 29,049